Spring Boot+Drools规则引擎整合详解
作者:Dem
本篇文章主要介绍了Spring Boot+Drools规则引擎整合,小编觉得挺不错的,现在分享给大家,也给大家做个参考。一起跟随小编过来看看吧
目的
官方的Drools范例大都是基于纯Java项目或Maven项目,而基于Spring Boot项目的很少。
本文介绍如何在Spring Boot项目上加上Drools规则引擎。
POM依赖
POM文件如下:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.galaxyyao</groupId> <artifactId>springbootdroolstest1</artifactId> <version>1.0.0</version> <packaging>jar</packaging> <name>springbootdroolstest1</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-core</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-compiler</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-decisiontables</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.drools</groupId> <artifactId>drools-templates</artifactId> <version>7.0.0.Final</version> </dependency> <dependency> <groupId>org.kie</groupId> <artifactId>kie-api</artifactId> <version>7.0.0.Final</version> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>exec-maven-plugin</artifactId> <configuration> <executable>java</executable> <arguments> <argument>com.galaxyyao.springbootdroolstest1.SpringBootDroolsTest1Application</argument> </arguments> </configuration> </plugin> </plugins> </build> </project>
其中比较需要注意的是使用了exec-maven-plugin插件,不然无法启动
引用的Drools包的版本可以自行调整。
Resources
在src/main/resources下添加两个目录:
META-INF和rules
META-INF下添加kmodule.xml,内容如下:
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule"> <kbase name="rules" packages="rules"> <ksession name="ksession-rules"/> </kbase> </kmodule>
rules目录下添加一个简单的Hello World规则
package com.galaxyyao.springbootdroolstest1 import com.galaxyyao.springbootdroolstest1.domain.Message dialect "mvel" rule "Hello World" dialect "mvel" when m : Message(status.equals(Message.HELLO), message : message ) then System.out.println( message); modify ( m ) { message = "Goodbye cruel world",status = Message.GOODBYE }; end rule "Good Bye" dialect "java" when Message( status == Message.GOODBYE, message : message ) then System.out.println( message ); end
Domain层
Domain层定义一个Drools中需要使用到的Model:
package com.galaxyyao.springbootdroolstest1.domain; public class Message { public static final Integer HELLO = 0; public static final Integer GOODBYE = 1; private String message; private Integer status; public String getMessage() { return this.message; } public void setMessage(String message) { this.message = message; } public Integer getStatus() { return this.status; } public void setStatus(Integer status) { this.status = status; } }
Service层
Service层负责实际运行规则:
package com.galaxyyao.springbootdroolstest1.service; import org.kie.api.KieServices; import org.kie.api.runtime.KieContainer; import org.kie.api.runtime.KieSession; import org.springframework.stereotype.Service; import com.galaxyyao.springbootdroolstest1.domain.Message; @Service public class DroolsService { public String fireRule() { // load up the knowledge base KieServices ks = KieServices.Factory.get(); KieContainer kContainer = ks.getKieClasspathContainer(); KieSession kSession = kContainer.newKieSession("ksession-rules"); // go ! Message message = new Message(); message.setMessage("Hello World"); message.setStatus(Message.HELLO); kSession.insert(message);//插入 kSession.fireAllRules();//执行规则 kSession.dispose(); return message.getMessage(); } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。